ia在医学上是Intra-Arterial的缩写，意思是动脉内的。
双语例句
1、The final recanalization rate， with embolus removal followed by intra-arterial thrombolysis， was 68.3%.
当栓子撤除紧接动脉内血栓溶解，最后的再通率是68.3%。
2、Objective: To evaluate the safety and efficacy of intra-arterial fibrinolysis in acute cerebral infarction.
目的：探讨急性脑梗塞动脉内溶栓治疗的安全性和有效性。
